Hey Mr Duff. Its Marco here from times long past! Hope you are well.
Featherweight is looking great so far. 4 bar lifter would be cool and you should definetly have some weight to spare. I had electronize for a long while but one started to fail (possibly a sticky relay). I upgraded to a scorpion XXL which worked nicely with 4 drill motors.
I have mounted drills like that in the past and it didnt work out too great. After a big flip I ocasionaly landed on one wheel and that often stripped a gear internally. If I were to use drills again I would brace the wheel on the other side. Bit of rod or a roller bearing.

Aside from that, good luck! See you at newport